What were you trying to do that didn't work

sg_persist/mpathpersist cmd cannot be successfully for iscsi lun disk.

What is the impact of this issue to you?

We can't use this command to test sd/sg disk persistent reservation in libvirt guest.

Please provide the package NVR for which the bug is seen:

python3-rtslib-2.1.76-8.el10.noarch
targetcli-2.1.58-2.el10.noarch
kernel-6.11.0-25.el10.x86_64

How reproducible is this bug?:

100%

Steps to reproduce

1. Prepare iscsi lun by targetcli.

# cat targetcli.sh
dd if=/dev/zero of=/var/tmp/emulated-iscsi count=1024 bs=1024K
targetcli /backstores/fileio/ create device.emulated-iscsi /var/tmp/emulated-iscsi
targetcli /iscsi/ create iqn.2024-10.com.virtemulated:emulated-iscsi-1.target
targetcli /iscsi/iqn.2024-10.com.virtemulated:emulated-iscsi-1.target/tpg1/luns/ create /backstores/fileio/device.emulated-iscsi
targetcli /iscsi/iqn.2024-10.com.virtemulated:emulated-iscsi-1.target/tpg1/acls/ create iqn.1994-05.com.redhat:1e2aecaec16c 
targetcli /iscsi/ create iqn.2024-10.com.virtemulated:emulated-iscsi-2.target
targetcli /iscsi/iqn.2024-10.com.virtemulated:emulated-iscsi-2.target/tpg1/luns/ create /backstores/fileio/device.emulated-iscsi
targetcli /iscsi/iqn.2024-10.com.virtemulated:emulated-iscsi-2.target/tpg1/acls/ create iqn.1994-05.com.redhat:1e2aecaec16c 
targetcli /iscsi/iqn.2024-10.com.virtemulated:emulated-iscsi-1.target/tpg1/ set attribute authentication=0 demo_mode_write_protect=0 generate_node_acls=1 cache_dynamic_acls=1
targetcli /iscsi/iqn.2024-10.com.virtemulated:emulated-iscsi-2.target/tpg1/ set attribute authentication=0 demo_mode_write_protect=0 generate_node_acls=1 cache_dynamic_acls=1
targetcli / saveconfig
iscsiadm -m discovery -t sendtargets -p 127.0.0.1

 
2. Login the iscsi lun and check the iscsi disk.

# iscsiadm -m node -T iqn.2024-10.com.virtemulated:emulated-iscsi-1.target -p 127.0.0.1 -l 
# iscsiadm -m node -T iqn.2024-10.com.virtemulated:emulated-iscsi-2.target -p 127.0.0.1 -l
# lsscsi
[0:2:0:0]    disk    DELL     PERC H745 Frnt   5.14  /dev/sda 
[1:0:0:0]    disk    LIO-ORG  device.emulated  4.0   /dev/sdb 
[2:0:0:0]    disk    LIO-ORG  device.emulated  4.0   /dev/sdc 

3. Run following sg_persist command to register key.
# sg_persist --out --register-ignore --param-sark 123aaa /dev/sdb -v
    inquiry cdb: [12 00 00 00 24 00]
  LIO-ORG   device.emulated   4.0 
  Peripheral device type: disk
    Persistent reservation out cdb: [5f 06 00 00 00 00 00 00 18 00]
Persistent reservation out:
Fixed format, current; Sense key: Not Ready
Additional sense: Logical unit communication failure
PR out (Register and ignore existing key): Sense category: 2

Expected results

# sg_persist --out --register-ignore --param-sark 123aaa /dev/sdb -v
    inquiry cdb: [12 00 00 00 24 00]
  LIO-ORG   device.emulated   4.0 
  Peripheral device type: disk
    Persistent reservation out cdb: [5f 06 00 00 00 00 00 00 18 00]
PR out: command (Register and ignore existing key) successful

Actual results
Failed to run sg_persist command

Additional info:
1) Passed in RHEL9.5 with python3-rtslib-2.1.76-1.el9.noarch and kernel-5.14.0-452.el9.x86_64 and targetcli-2.1.57-2.el9.noarch.
2) Found a previous related bug 1658988 : passed with creating /etc/target/pr according to the comment. But according to bug 1658988#c24 , the /var/target/pr exists:
# ll /var/target/
total 0
drwxr-xr-x. 2 root root 6 Jun 23 20:00 alua
drwxr-xr-x. 2 root root 6 Jun 23 20:00 pr